Congratulations and welcome. I would recommend if you haven't purchased them already a weight distribution hitch, sway control device, and an electronic brake controller. Also some basic rv supplies, fresh water hose, rv electrical cord with additional 50, 30, 20 amp adapters, sewer hose, rv toilet paper, toilet chemical,basic tool kit,first aid kit, wheel chocks, and propane. Check out
RV Travel Checklist, Camping Check List, RV Supplies - Trailer Life Directory for additional items that you might need.
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